我开发一个应用程序，需要直接访问SD卡的根文件夹，但它似乎在安卓4.2，标准/ SD卡目录现在指向一个模拟SD卡特定于运行应用程序的用户。这是不好的，因为我的应用程序需要访问存储在SD卡的顶层文件。有谁知道如何直接访问SD卡中的Andr​​oid 4.2？

I am developing an app that needs direct access to the root folder of the sdcard, however it seems in Android 4.2, the standard /sdcard directory now points to an "emulated" sdcard specific to the user running the app. This is not good, as my app requires access to a file that is stored on the top level of the sdcard. Does anyone know how to directly access the sdcard in Android 4.2?

推荐答案

你能使用的存储目录作为文件类型？ （的java.io.File ）

Can you use the storage directory as a File type? (java.io.File)

如果是这样，你可以得到外部存储（通常SD卡，但会在手机上没有SD卡主存储器）使用code像这样在你的方法：

If so, you can get the external storage (Typically SD card, but will be main storage on phones with no SD card) by using code such as this in your method:

File path = Environment.getExternalStorageDirectory();

此外，存储访问需要 READ_EXTERNAL_STORAG​​E 允许在你的Andr​​oid清单 - 以 WRITE_EXTERNAL_STORAG​​E 如果任何数据是被需要改性。下面是这些权限，因为它们将出现在该清单：

Additionally, access of storage requires READ_EXTERNAL_STORAGE permission in your Android Manifest - with WRITE_EXTERNAL_STORAGE being needed if any data is modified. Here are these permissions as they would appear in the manifest:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

来源：

http://developer.android.com/reference/android/os/ Environment.html http://developer.android.com/reference/android/Manifest.permission.html